本文選題：松遼盆地　切入點(diǎn)：晚三冬期　出處：《地學(xué)前緣》2017年01期 　論文類型：期刊論文

【摘要】：松遼盆地發(fā)育了一套連續(xù)的晚白堊世陸相沉積地層,是研究古氣候/環(huán)境的理想場(chǎng)所。本研究以松遼盆地露頭剖面為研究材料,通過(guò)測(cè)定總有機(jī)碳(TOC)含量、穩(wěn)定碳同位素(δ~(13) Corg)組成和一些分子標(biāo)志物,并分析它們?cè)谡麄�(gè)剖面的分布和變化特征,重建了松遼盆地晚三冬期的氣候環(huán)境變化。結(jié)果顯示:(1)松遼盆地晚三冬期湖泊沉積物有機(jī)質(zhì)豐度表現(xiàn)出階段Ⅰ和Ⅲ高,階段Ⅱ和Ⅳ相對(duì)較低的特征,主要受水生生物繁盛程度和保存條件的控制。階段Ⅰ和Ⅲ,較高TOC值、相對(duì)偏負(fù)δ~(13) Corg值和分子標(biāo)志物(正構(gòu)烷烴、C_(30)甾烷系列化合物和藿烷)組成和分布顯示有機(jī)質(zhì)來(lái)源于藻類、細(xì)菌和陸地植物;階段Ⅱ高豐度中碳數(shù)正烷烴分布特征表明有機(jī)質(zhì)主要來(lái)源于水生生物;階段Ⅳ持續(xù)偏正δ~(13) Corg值顯示出來(lái)源于陸地有機(jī)質(zhì)輸入逐漸增加。(2)Pr/Ph值的變化顯示松遼古湖泊晚三冬期水體從還原變到氧化,再到還原,再逐漸變?yōu)檠趸沫h(huán)境變化過(guò)程;階段Ⅰ和Ⅱ高Ga/C_(30)Hop值顯示嫩江組一段存在顯著的水體分層。(3)C_(30)甾烷系列化合物(24-正丙基膽甾烷、24-異丙基膽甾烷和甲藻甾烷)的檢出表明松遼盆地晚三冬期發(fā)生了海侵事件。階段ⅢC_(30)甾烷含量顯著高于階段Ⅰ表明嫩江組二段下部的海侵程度顯著強(qiáng)于嫩江組一段。此外,高C_(30)甾烷含量對(duì)應(yīng)于高TOC值,顯示出海侵發(fā)生的層位與烴源巖發(fā)育的層位吻合。
[Abstract]:A series of successive late Cretaceous continental sedimentary strata have been developed in Songliao Basin, which is an ideal place to study paleoclimate / environment. In this study, the total organic carbon (TOC) content was determined by using outcrop section of Songliao Basin as the research material. Stable carbon isotope (未 ~ (13)) C _ (g) composition and some molecular markers, and their distribution and variation characteristics throughout the profile are analyzed. The climatic and environmental changes of late three winters in Songliao Basin were reconstructed. The results show that the abundance of organic matter in lake sediments of Songliao Basin in the late three winters of Songliao Basin is high in stage 鈪，

本文編號(hào)：1621228